A silver-white metal X taken in the form of ribbon, when ignited, burns in air with a dizzling white flame to form a white powder Y. When is added to powder Y, it dissolves partially to from another substance Z.
(a) What could metal X be ?
(b) What is powder Y ?
(c ) With which substance metal X combines to form powder Y ?
(d) What is substance Z ? Name one domestic use of substance Z.
(e) Write a balanced chemical equation of the reaction which takes place when metal X burns in air to form powder Y.

Explanation

(a) The metal is X is Mg. (b) The white powder Y is MgO. (c) White powder Y dissolves partially in form substance Z. It is `Mg(OH)_(2)` and is used as an antacid.
(d) The chemical reactions that are taking place are :
`{:(2Mg(s) + O_(2)(g), overset("(Ignition)")to2MgO(s)),((X), " "(Y)):}`
`{:(MgO(s) + H_(2)O(aq), to Mg(OH)_(2)(aq)),((Y)," "(Z)):}`